Auction problems!!!

I was in a auction a week ago, right. An I won. Now my alerts did not show up saying the user replied informing me that I won. Then he inbixed me. We have different timelines so I was asleep when he inboxed me. When I woke upi checked the website and replied to his inbox,, the auction WAS over ad I won it. The next day he informed me that I lost it? No,,I won it. This user cannot keep a auction going after someone won it! In the inbox he Sao once you've contacted me u get it. I replied ok.Can anyone help with this matter as he refuses to give me what I won in the auction